Mix cream cheese, sugar, flour, lemon peel, orange peel, and vanilla together. Stir together until creamy. Slowly blend in eggs one at a time (the last 2 eggs-use yolks only). Use mixer on medium speed. In separate bowl, mix graham cracker crumbs, sugar and butter. Pour into pie plate or round pan. Bake for 10 minutes on 350 degrees and then 1 hour on 250 degrees. (Longer if necessary)